Water temperature is often monitored at water sources and treatment works; however, there is limited monitoring of the water temperature in the drinking water distribution system (DWDS), despite a known impact on physical, chemical and microbial reactions which impact water quality. A key parameter influencing drinking water temperature is soil temperature, which is influenced by the urban heat island effects. This paper provides critique and comprehensive summary of the current knowledge, policies and challenges regarding drinking water temperature research and presents the findings from a survey of international stakeholders. Knowledge gaps as well as challenges and opportunities for monitoring and research are identified. The conclusion of the study is that temperature in the DWDS is an emerging concern in various countries regardless of the water source and treatment, climate conditions, or network characteristics such as topology, pipe material or diameter. More research is needed, especially to determine (i) the effect of higher temperatures, (ii) a legislative limit on temperature and (iii) measures to comply with this limit.

In this study, removal of arsenic ions using two industrial by‐products as adsorbents is represented. Removal of As(III) and As(V) from water was carried out with industrial by‐products: residual from the groundwater treatment process, iron‐manganese oxide coated sand (IMOCS), and blast furnace slag from steel production (BFS), both inexpensive and locally available. In addition, the BFS was modified in order to minimise its deteriorating impact on the initial water quality. Kinetic and equilibrium studies were carried out using batch and fixed‐bed column adsorption techniques under the conditions that are likely to occur in real water treatment systems. To evaluate the application for real groundwater treatment, the capacities of the selected materials were further compared to those exhibited by commercial sorbents, which were examined under the same experimental conditions. IMOCS was found to be a good and inexpensive sorbent for arsenic, while BFS and modified slag showed the highest affinity towards arsenic. All examined waste materials exhibited better sorption performances for As(V). The maximum sorption capacity in the batch reactor was obtained for blast furnace slag, 4040 μgAs(V)/g.

This paper presents the results of the investigation of pollutant build-up on impervious surfaces of a parking lot in Belgrade, Serbia during the summer months. Contaminant build-up was found to be greater on asphalt surfaces directly exposed to vehicular traffic than on concrete walkways. The difference in the amounts of accumulated pollutants between asphalt and concrete were significant: for total solids (TS), total suspended solids (TSS), chemical oxygen demand (COD), heavy metals and total phosphorus (TP) accumulations were two to three times higher, while only 30% higher for total nitrogen (TN) and anions. Build-up of most of the measured parameters was best described by power functions. The highest surface loads were found for solids, COD, iron and zinc. A strong correlation was found between turbidity, TS, TSS, COD, heavy metals and phosphorus, while conductivity, nitrates and nitrites were weakly correlated to other parameters.

The paper presents an analysis of water losses from 42 waterworks in the Republic of Serbia using the ILI indicator and expressing losses as a percentage of input system volume. The analysis was performed using available data, with missing data being adopted by assessing operating conditions. The analysis clearly indicated the advantages of using the ILI indicator, which takes into account the local specificities of the configuration and operation of the waterworks system. Paper points out the risk of using data on water losses expressed as a percentage of system input volume, and in particular of arbitrarily prescribing a target percentage of water losses, without analyzing the state and characteristics of a specific waterworks system, as this approach can lead to setting unrealistic and unachievable goals. A preliminary methodological framework for defining targeted water losses in Serbia is presented as well as the need for further research and improvement of the reliability of data on distribution water systems in order to increase the reliability of water loss estimates and realistically set water loss reduction goals.

The paper presents challenges that urban drainage has to solve under altering hydrological regime due to urbanization. The need for reducing the negative impacts of urbanization on the quantity and quality of urban runoff is emphasized. Innovative methods of urban drainage have been presented, together with general recommendations for their application. The requirements from the proposal of the new EU Directive on urban wastewater related to the integrated management of urban wastewater, including rainwater, are presented in more detail.